Fig. 2

Activation of caspase-3/− 7 after 24 h of treatment with acetone leaf extracts of Croton sylvaticus (a), Croton pseudopulchellus (b) and Croton gratissimus (c) on cancerous A549, Caco-2, HeLa and MCF-7 cells. The caspase-3/− 7 activity is expressed as percentage or fold change to the untreated cells (control). Data are presented as mean ± standard error of three independent experiments. *P < 0.05 and **P < 0.01 indicate the significant difference compared to the control. CSA, CPA and CGA represent respectively acetone leaf extracts of Croton sylvaticus, Croton pseudopulchellus and Croton gratissimus. Ctrl: control group (0.5% DMSO)